10. Seiko Think the Earth Wn-2

Seiko

The Think the Earth Wn-2 watch is definitely one of the watches that makes you perpetually wonder how it works. The small globe is a replica of the real globe, at a scale of 1:580 millionth of the actual planet Earth. Cool thing is that it rotates at the same speed as the real Earth (yes, counter clockwise, and one full turn takes 24 hours). Two small indicators display hours and minutes.